EP0621490A3 - Testing of electrical circuits. - Google Patents

Testing of electrical circuits. Download PDF

Info

Publication number
EP0621490A3
EP0621490A3 EP94302175A EP94302175A EP0621490A3 EP 0621490 A3 EP0621490 A3 EP 0621490A3 EP 94302175 A EP94302175 A EP 94302175A EP 94302175 A EP94302175 A EP 94302175A EP 0621490 A3 EP0621490 A3 EP 0621490A3
Authority
EP
European Patent Office
Prior art keywords
asynchronous signal
pulses
range
asserted
asynchronous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94302175A
Other languages
German (de)
French (fr)
Other versions
EP0621490A2 (en
Inventor
Stephen C Kromer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Advanced Micro Devices Inc
Original Assignee
Advanced Micro Devices Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Advanced Micro Devices Inc filed Critical Advanced Micro Devices Inc
Publication of EP0621490A2 publication Critical patent/EP0621490A2/en
Publication of EP0621490A3 publication Critical patent/EP0621490A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
    • G06F11/2273—Test methods

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Tests Of Electronic Circuits (AREA)
  • Test And Diagnosis Of Digital Computers (AREA)

Abstract

The invention facilitates testing of electrical circuitry which includes a circuit receiving a signal asynchronous with respect to the circuit clock. The exact clock pulse on which the asynchronous signal is asserted may be difficult or impossible to predict even when the circuitry inputs are known. However, a range of pulses can be determined during which the asynchronous signal is asserted. The sampling of the asynchronous signal is blocked until the end of the range of pulses. If it is known that at the end of the range of pulses the asynchronous signal should still be asserted provided that the circuitry functions properly, the asynchronous signal is sampled at the end of the range of pulses. Alternatively, if the asynchronous signal can be deasserted by the end of the range of pulses, the assertion of the asynchronous signal is detected and latched by the asynchronous signal pulse detector, and at the end of the range of pulses the circuit samples the value latched by the pulse detector. Thus, the clock pulse at which the asynchronous signal should be sampled as asserted is unambiguously determined, and testing is therefore facilitated.
EP94302175A 1993-04-20 1994-03-25 Testing of electrical circuits. Withdrawn EP0621490A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US49886 1993-04-20
US08/049,886 US5420874A (en) 1993-04-20 1993-04-20 Testing of electrical circuits

Publications (2)

Publication Number Publication Date
EP0621490A2 EP0621490A2 (en) 1994-10-26
EP0621490A3 true EP0621490A3 (en) 1995-07-26

Family

ID=21962261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94302175A Withdrawn EP0621490A3 (en) 1993-04-20 1994-03-25 Testing of electrical circuits.

Country Status (3)

Country Link
US (1) US5420874A (en)
EP (1) EP0621490A3 (en)
JP (1) JPH06324905A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5656953A (en) * 1995-05-31 1997-08-12 Texas Instruments Incorporated Low overhead memory designs for IC terminals
US6405335B1 (en) 1998-02-25 2002-06-11 Texas Instruments Incorporated Position independent testing of circuits
US6728915B2 (en) 2000-01-10 2004-04-27 Texas Instruments Incorporated IC with shared scan cells selectively connected in scan path
US6769080B2 (en) 2000-03-09 2004-07-27 Texas Instruments Incorporated Scan circuit low power adapter with counter
US20110219266A1 (en) * 2010-03-04 2011-09-08 Qualcomm Incorporated System and Method of Testing an Error Correction Module

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60124746A (en) * 1983-12-09 1985-07-03 Fujitsu Ltd Data processing unit
DE3725823A1 (en) * 1986-08-04 1988-02-18 Mitsubishi Electric Corp INTEGRATED SEMICONDUCTOR SWITCHING DEVICE
US5097468A (en) * 1988-05-03 1992-03-17 Digital Equipment Corporation Testing asynchronous processes
US5166604A (en) * 1990-11-13 1992-11-24 Altera Corporation Methods and apparatus for facilitating scan testing of asynchronous logic circuitry

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3042811A (en) * 1958-05-29 1962-07-03 Ibm Synchronized gated transistor trigger circuit
US3225301A (en) * 1963-06-04 1965-12-21 Control Data Corp Pulse resynchronizing system for converting asynchronous, random length data signal into data signal synchronous with clock signal
US3304504A (en) * 1964-12-14 1967-02-14 Frank J Horlander Gate generator synchronizer
US3764920A (en) * 1972-06-15 1973-10-09 Honeywell Inf Systems Apparatus for sampling an asynchronous signal by a synchronous signal
US5047658A (en) * 1990-06-01 1991-09-10 Ncr Corporation High frequency asynchronous data synchronizer
US5128970A (en) * 1990-12-20 1992-07-07 Unisys Corporation Non-return to zero synchronizer
US5256912A (en) * 1991-12-19 1993-10-26 Sun Microsystems, Inc. Synchronizer apparatus for system having at least two clock domains

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60124746A (en) * 1983-12-09 1985-07-03 Fujitsu Ltd Data processing unit
DE3725823A1 (en) * 1986-08-04 1988-02-18 Mitsubishi Electric Corp INTEGRATED SEMICONDUCTOR SWITCHING DEVICE
US5097468A (en) * 1988-05-03 1992-03-17 Digital Equipment Corporation Testing asynchronous processes
US5166604A (en) * 1990-11-13 1992-11-24 Altera Corporation Methods and apparatus for facilitating scan testing of asynchronous logic circuitry

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 285 (P - 404) 12 November 1985 (1985-11-12) *

Also Published As

Publication number Publication date
EP0621490A2 (en) 1994-10-26
US5420874A (en) 1995-05-30
JPH06324905A (en) 1994-11-25

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